<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			*{padding: 0;margin: 0;}
			.box{
				width: 200px;
				height: 200px;
				background: red;
				text-align: center;
				color: white;
				line-height: 200px;
				font-size: 23px;
				font-weight: bold;
				margin: 20px auto;
				}
		</style>
	</head>
	<body>
		<div class="box">
			点击有惊喜！！
		</div>
		<!--<div class="box"></div>-->
	</body>
	<script type="text/javascript">
		
		var oBox = document.getElementsByClassName('box')[0];
		console.log(oBox.innerText);
		
		var a = 0;
		
		oBox.onclick  = function(){
			a++;
			if(a%4===1){
				this.style.background = 'green';
				this.innerText = '继续点击哦！';
			}else if(a%4===2){
				this.style.background = 'blue';
				this.innerText = '哈哈！骗你的';
			}else if(a%4===3){
				this.style.background = 'transparent';
				this.innerText = '';
			}else{
				this.style.background = 'red';
				this.innerText = '点击有惊喜！！';
			}	
			
		}
		
	</script>
</html>
